Selling a house while on a fixed-rate mortgage

You can usually sell a property even if you’re part-way through a fixed-rate mortgage. The main issue is that many fixed-rate deals include early repayment charges (ERCs) if you repay the mortgage balance before the end of the fixed term.

Depending on your circumstances, you may be able to port your mortgage to your next home, which can help you avoid or reduce ERCs. If porting isn’t available, or it doesn’t work out financially, you may need to consider paying the ERC and arranging a new mortgage.

This guide explains how the decision typically works and what to check before you commit to a sale.

Can you sell with a fixed-rate mortgage?

In most cases, yes. A fixed-rate mortgage doesn’t prevent you from selling—however, it can affect the cost of doing so.

If you repay your mortgage early, your lender may apply an ERC. The exact amount depends on the mortgage contract and how much time is left on the fixed term.

What early repayment charges usually depend on

ERCs are commonly influenced by:

• How long is left on the fixed term (charges often reduce the closer you get to the end)
• Your mortgage balance at the time of repayment
• Whether the ERC is calculated as a percentage or uses a different structure
• Whether any exceptions apply in your specific mortgage agreement

Some fixed-rate mortgages are structured differently, and a small number may allow earlier repayment with little or no ERC. In practice, though, most borrowers should assume there will be a cost unless their lender confirms otherwise.

If you’re moving: porting your mortgage

When you buy another property, one option is to port your mortgage. Porting means transferring your existing mortgage deal to a new property, rather than repaying it and starting again.

Porting can be attractive because it may help you avoid ERCs (or reduce what you’d otherwise pay). However, porting is not automatic.

When porting can be complicated

Even if your mortgage is, in principle, portable, porting may not be possible if circumstances or property details don’t meet the lender’s requirements.

Porting may be declined or limited if, for example:

• Your income or financial situation has changed and you no longer meet the lender’s affordability assessment
• The lender’s current lending criteria have changed since you took the mortgage
• The lender is unwilling to continue the mortgage under the same terms for your new purchase
• The new property doesn’t meet the lender’s property requirements (for example, certain construction types or other non-standard features)

Because porting decisions can depend on both you and the property, it’s important to treat it as a process that needs confirmation—not a guaranteed outcome.

Porting vs paying the ERC: how to compare

For many home-movers, the choice is effectively between:

1. Porting the mortgage to the next property (if possible), or
2. Paying the ERC and arranging a new mortgage deal

The “best” route depends on the numbers and the practicalities of your move.

Factors that often tip the balance

When comparing options, borrowers typically look at:

• Total cost of the ERC versus the potential savings from keeping the fixed rate
• Whether you can port on the same terms and what fees (if any) apply to the porting process
• What mortgage rate you could get if you repay and remortgage (including whether you’d be able to borrow the amount you need)
• Timing — for example, whether waiting until the fixed term ends would reduce or remove ERCs
• Risk and certainty — whether porting is likely to be confirmed in time for your sale and purchase dates

If your ERC reduces over time, the timing of your sale can matter. Some borrowers choose to align the move with the end of the fixed term to avoid charges, where that’s feasible.

What if you don’t need another mortgage?

If you’re selling and not buying again with a mortgage—such as moving in with someone, downsizing into a property you can fund outright, or renting instead—porting usually isn’t relevant.

In these situations, the typical outcomes are:

• Pay the ERC (if you repay the mortgage early), or
• Adjust the plan to avoid triggering the ERC where possible

If you’re unsure whether you’ll need a mortgage on the next step, it can help to map out your likely options early, because the availability of porting depends on whether you’re taking on a new mortgage for the next purchase.

Key checks before you commit to a sale

Before you exchange contracts, it’s worth gathering the information that will shape your decision.

Consider:

• How much time is left on your fixed-rate term
• What your ERC would be if you repay at the point you expect to complete
• Whether your mortgage is portable and what the lender requires for a port
• Whether your affordability is likely to be reassessed for the new property
• Whether the new property is likely to meet the lender’s criteria

Having these details can reduce the risk of last-minute surprises when sale and purchase timelines overlap.

Working with a broker for a move during a fixed term

Selling while on a fixed-rate mortgage often involves multiple moving parts: ERCs, porting rules, affordability checks, and the practicalities of buying another home.

A broker can help you compare the likely cost and feasibility of:

• Porting with your current lender
• Paying the ERC and remortgaging with another lender
• Timing the move to reduce charges where that’s possible

This can be particularly useful when you’re balancing a sale completion date with a purchase, or when your circumstances may have changed since the original mortgage was agreed.

Summary

• You can generally sell during a fixed-rate mortgage term.
• The main cost risk is early repayment charges.
• Porting may help if you’re buying another property and your lender will allow it.
• If porting isn’t available or doesn’t work out, you may need to pay the ERC and arrange a new mortgage.
• The best decision depends on the ERC amount, porting feasibility, timing, and the mortgage options available for your next home.